Abstract
Pulsed laser ablation deposition has been used to grow polycrystalline Pb–M and Sr–M thin films with high coercivity on Si/SiO 2 substrates. The influence of the substrate temperature (550–800 °C) and the oxygen pressure (1.0–3.0 mbar) on the magnetic properties during the deposition is discussed. The Pb–M hexaferrite thin films crystallise at the same temperature range as Sr–M thin films, but with inferior coercivities. In both cases, the best values of iHc (3.8 kOe, Pb–M films and 5.0 kOe for Sr–M thin film) are very close to the best value of sintered ceramic hexaferrite (5.0 kOe Pb–M and 6.0 kOe Sr–M). The isotropic character of the films was confirmed by a Mr/Ms behaviour near to 0.5.
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